There are some genuinely nice people, though. The ones that don't do it to create an appearance of being nice, just because their inner morals force them to. Sometimes that inner voice compels me to be nice and it upsets me when people assume I'm just acting (they rarely do though, because I appear as a jerk and they don't notice anyway).
But I agree that the fake "nice" people are trash, and it just takes a good trololol "social experiment" for their mask to fall of.